EP2921321B1 - Luftreifen - Google Patents
Luftreifen Download PDFInfo
- Publication number
- EP2921321B1 EP2921321B1 EP13859829.7A EP13859829A EP2921321B1 EP 2921321 B1 EP2921321 B1 EP 2921321B1 EP 13859829 A EP13859829 A EP 13859829A EP 2921321 B1 EP2921321 B1 EP 2921321B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mass
- layer
- less
- parts
- rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920000642 polymer Polymers 0.000 claims description 73
- 229920001971 elastomer Polymers 0.000 claims description 70
- 239000005060 rubber Substances 0.000 claims description 69
- 239000000203 mixture Substances 0.000 claims description 56
- 238000004073 vulcanization Methods 0.000 claims description 54
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 claims description 26
- 239000011324 bead Substances 0.000 claims description 25
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 24
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 23
- 239000011593 sulfur Substances 0.000 claims description 23
- 229910052717 sulfur Inorganic materials 0.000 claims description 23
- 239000003963 antioxidant agent Substances 0.000 claims description 17
- 244000043261 Hevea brasiliensis Species 0.000 claims description 13
- 230000003078 antioxidant effect Effects 0.000 claims description 13
- 229920003052 natural elastomer Polymers 0.000 claims description 13
- 229920001194 natural rubber Polymers 0.000 claims description 13
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 13
- 239000011787 zinc oxide Substances 0.000 claims description 12
- 235000021355 Stearic acid Nutrition 0.000 claims description 11
- 229920005549 butyl rubber Polymers 0.000 claims description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 11
- 239000008117 stearic acid Substances 0.000 claims description 11
- 229920003049 isoprene rubber Polymers 0.000 claims description 10
- UHKPXKGJFOKCGG-UHFFFAOYSA-N 2-methylprop-1-ene;styrene Chemical compound CC(C)=C.C=CC1=CC=CC=C1.C=CC1=CC=CC=C1 UHKPXKGJFOKCGG-UHFFFAOYSA-N 0.000 claims description 6
- 229920005995 polystyrene-polyisobutylene Polymers 0.000 claims description 6
- 229920000428 triblock copolymer Polymers 0.000 claims description 6
- 239000010410 layer Substances 0.000 description 112
- 230000000052 comparative effect Effects 0.000 description 25
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 20
- 239000000853 adhesive Substances 0.000 description 19
- 230000001070 adhesive effect Effects 0.000 description 19
- 229920002725 thermoplastic elastomer Polymers 0.000 description 19
- 238000005096 rolling process Methods 0.000 description 14
- 238000001125 extrusion Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000009472 formulation Methods 0.000 description 11
- 235000014692 zinc oxide Nutrition 0.000 description 11
- 239000000654 additive Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 7
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920005992 thermoplastic resin Polymers 0.000 description 4
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000010552 living cationic polymerization reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- ZZMVLMVFYMGSMY-UHFFFAOYSA-N 4-n-(4-methylpentan-2-yl)-1-n-phenylbenzene-1,4-diamine Chemical compound C1=CC(NC(C)CC(C)C)=CC=C1NC1=CC=CC=C1 ZZMVLMVFYMGSMY-UHFFFAOYSA-N 0.000 description 2
- 229920002633 Kraton (polymer) Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
- 239000002808 molecular sieve Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 150000002989 phenols Chemical class 0.000 description 2
- -1 phosphors Chemical class 0.000 description 2
- 229920006254 polymer film Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 150000003585 thioureas Chemical class 0.000 description 2
- VFWCMGCRMGJXDK-UHFFFAOYSA-N 1-chlorobutane Chemical compound CCCCCl VFWCMGCRMGJXDK-UHFFFAOYSA-N 0.000 description 1
- KPJKMUJJFXZGAX-UHFFFAOYSA-N 2-chloropropan-2-ylbenzene Chemical compound CC(C)(Cl)C1=CC=CC=C1 KPJKMUJJFXZGAX-UHFFFAOYSA-N 0.000 description 1
- NMWDYLYNWRFEMR-UHFFFAOYSA-N 2-methylpyridine Chemical compound CC1=CC=CC=N1.CC1=CC=CC=N1 NMWDYLYNWRFEMR-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- RSPISYXLHRIGJD-UHFFFAOYSA-N OOOO Chemical compound OOOO RSPISYXLHRIGJD-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229920005556 chlorobutyl Polymers 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012990 dithiocarbamate Substances 0.000 description 1
- 150000004659 dithiocarbamates Chemical class 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 150000002357 guanidines Chemical class 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000002460 imidazoles Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- GYNNXHKOJHMOHS-UHFFFAOYSA-N methyl-cycloheptane Natural products CC1CCCCCC1 GYNNXHKOJHMOHS-UHFFFAOYSA-N 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 235000001508 sulfur Nutrition 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 150000003557 thiazoles Chemical class 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 150000003613 toluenes Chemical class 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical group [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0008—Compositions of the inner liner
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
- C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
- C08L23/22—Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C5/00—Inflatable pneumatic tyres or inner tubes
- B60C5/12—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim
- B60C5/14—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre
- B60C2005/145—Inflatable pneumatic tyres or inner tubes without separate inflatable inserts, e.g. tubeless tyres with transverse section open to the rim with impervious liner or coating on the inner wall of the tyre made of laminated layers
Definitions
- the present invention relates to a pneumatic tire comprising an inner liner.
- weight saving in tires has been pursued because of strong social demands for reducing the fuel efficiency of automobiles.
- weight saving and the like have also been pursued in an inner liner, which is placed inwardly in a tire radius direction, and serves to reduce the amount of leakage of air from the inside to the outside of a pneumatic tire (the amount of air permeation) to improve the air permeation resistance.
- butyl-based rubber containing 70 to 100% by mass of butyl rubber and 30 to 0% by mass of natural rubber is used to improve the air permeation resistance of a tire.
- the butyl-based rubber contains about 1% by mass of isoprene, which, together with sulfur, a vulcanization accelerator, and zinc oxide, allows crosslinking with adjacent rubber.
- the above-described butyl-based rubber requires a thickness of 0.6 to 1.0 mm for tires for passenger cars, and a thickness of about 1.0 to 2.0 mm for tires for trucks and buses.
- thermoplastic elastomer superior in air permeation resistance than the butyl-based rubber, and can reduce the thickness of the inner liner.
- Japanese Patent Laying-Open No. 2008-174037 proposes improving flection resistance in a pneumatic tire having an air permeation preventing layer on an inner side of a carcass layer.
- the air permeation preventing layer is made of a thermoplastic resin or a thermoplastic elastomer composition containing the thermoplastic resin and an elastomer.
- the flection resistance is improved by configuring the pneumatic tire such that an average thickness Gs of the air permeation preventing layer in a region Ts from the vicinity of a maximum width end of a belt layer to a tire maximum width becomes thinner than an average thickness Gf of the air permeation preventing layer in a region Tf from the tire maximum width to a bead toe.
- peeling may occur between the rubber layer of the carcass ply and the air permeation preventing layer.
- EP 2 774 779 A1 which is a prior art document under Article 54 (3) EPC, discloses a pneumatic tire with an inner liner being made of two layers, wherein the first layer includes a styrene-isobutylene-styrene triblock copolymer, the second layer includes at least one of styrene-isoprene-styrene triblock copolymer and/or styrene-isobutylene diblock copolymer, and wherein the ratio Gs/Gb is 0.5 to 0.7.
- EP 2 415 617 A1 discloses a polymer laminate for an inner liner including a first layer and a second layer, wherein the first layer contains 5 to 40% by mass of a styrene-isobutylene-styrene triblock copolymer and 60 to 95% by mass of natural rubber, isoprene rubber and/or butyl rubber, wherein the second layer comprises a thermoplastic elastomer.
- WO 2012/157322 A1 discloses an inner liner having a ratio of Gs/Gb of 0.3 to 0.75 and preferably of 0.5 to 0.75.
- PTD 1 Japanese Patent Laying-Open No. 2008-174037
- An object of the present invention is to provide a pneumatic tire that is excellent in air permeation resistance, crack resistance performance, and riding comfort, and having reduced rolling resistance.
- the present invention provides a pneumatic tire including an inner liner on an inner side of the tire, the inner liner including a first layer including a first polymer composition having a polymer component containing not less than 5% by mass and not more than 70% by mass of a styrene-isobutylene-styrene triblock copolymer, and not less than 30% by mass and not more than 95% by mass of at least one rubber component selected from the group consisting of a natural rubber, an isoprene rubber, and a butyl rubber; and a second layer including a second polymer composition having a polymer component containing not less than 10% by mass and not more than 85% by mass of at least any of a styrene-isoprene-styrene triblock copolymer and a styrene-isobutylene diblock copolymer, and not less than 10% by mass and not more than 90% by mass of at least one rubber component selected from the group consisting of a natural
- average thickness Gs of the buttress region in the inner liner is not less than 0.06 mm and not more than 0.30 mm.
- At least any of the first polymer composition and the second polymer composition contains, based on 100 parts by mass of the polymer component, not less than 0.1 parts by mass and not more than 5 parts by mass of sulfur, not less than 1 part by mass and not more than 5 parts by mass of stearic acid, not less than 0.1 parts by mass and not more than 8 parts by mass of zinc oxide, not less than 0.1 parts by mass and not more than 5 parts by mass of an antioxidant, and not less than 0.1 parts by mass and not more than 5 parts by mass of a vulcanization accelerator.
- a pneumatic tire that is excellent in air permeation resistance, crack resistance performance, and riding comfort, and having reduced rolling resistance.
- Fig. 1 is a cross-sectional view of a right half of a pneumatic tire for a passenger car.
- Pneumatic tire 1 has a tread portion 2, and a side-wall portion 3 and a bead portion 4 forming a troidal shape from the ends of the tread portion.
- a bead core 5 is embedded in bead portion 4.
- a carcass ply 6 and a belt layer 7 are placed.
- Carcass ply 6 is provided to extend from one bead portion 4 to the other bead portion, and is anchored by folding its ends around bead cores 5.
- Belt layer 7, which is formed of at least two plies, is placed outside a crown portion of carcass ply 6.
- Belt layer 7 is placed such that two plies, which are generally formed of cords such as steel cords or aramid fibers, are placed to allow the cords to cross each other between the plies normally at an angle of 5° to 30° relative to a tire circumferential direction.
- topping rubber layers can be provided on the outer sides of the ends of the belt layer to reduce peeling in the ends of the belt layer.
- organic fiber cords of polyester, nylon, aramid, or the like are arranged at substantially 90° relative to the tire circumferential direction.
- a bead apex 8 is placed to extend from an upper end of bead core 5 in a sidewall direction.
- an inner liner 9 is placed inwardly relative to carcass ply 6 in a tire radial direction, so as to extend from one bead portion 4 to the other bead portion 4.
- Inner liner 9 is formed such that an average thickness Gs of inner liner 9 in a buttress region Rs from a tire maximum width position Le to a position corresponding to a belt layer end Lu becomes thinner than an average thickness Gb of inner liner 9 in a bead region Rb from tire maximum width position Le to a bead toe Lt.
- the thickness of the inner liner in buttress region Rs is made thinner, even if shear deformation due to repeated flection deformation occurs in that region during running with the tire, the stress can be relieved, and cracks can be prevented from occurring.
- a ratio of average thickness Gs in buttress region Rs of the inner liner to average thickness Gb in bead region Rb (Gs/Gb) is set to not less than 0.5 and not more than 0.7. Furthermore, to attain an effect of relieving stress in the buttress region while maintaining air pressure retaining performance, average thickness Gs of buttress region Rs in the inner liner is preferably not more than 0.06 mm and not less than 0.30 mm.
- the inner liner used in the pneumatic tire includes a first layer and a second layer.
- the first layer includes a first polymer composition having a polymer component containing not less than 5% by mass and not more than 70% by mass of a styrene-isobutylene-styrene triblock copolymer (hereinafter also referred to as the SIBS), and not less than 30% by mass and not more than 95% by mass of at least one rubber component selected from the group consisting of a natural rubber, an isoprene rubber, and a butyl rubber.
- SIBS styrene-isobutylene-styrene triblock copolymer
- the isobutylene block of the SIBS contributes to providing a polymer film made of the SIBS with excellent air permeation resistance.
- the inner liner produced with the SIBS therefore, has excellent air permeation resistance.
- the SIBS since the SIBS has a completely saturated molecular structure except for its aromatic rings, the SIBS is unlikely to become deteriorated and hardened, and has excellent durability.
- the use of the SIBS allows a decrease in the thickness of the film, thus allowing weight saving in a tire to achieve improved fuel efficiency.
- a weight-average molecular weight measured by GPC is preferably 50,000 to 400,000, from the viewpoint of the rubber elasticity and fluidity of the SIBS, as well as moldability to the inner liner. If the weight-average molecular weight is less than 50,000, the rubber elasticity, tensile strength, and tensile elongation of the SIBS may deteriorate. On the other hand, if the weight-average molecular weight exceeds 400,000, deterioration of the fluidity of the SIBS may cause moldability (extrusion moldability, for example) to the inner liner to deteriorate. From the viewpoint of achieving better air permeation resistance and durability, the SIBS preferably has a styrene component content of 10 to 40% by mass.
- the SIBS can be obtained using a general polymerization method for a vinyl-based compound, such as a living cationic polymerization method.
- the first polymer composition contains a rubber component.
- the rubber component is capable of providing the first polymer composition with tackiness before vulcanization to the second layer. Moreover, the rubber component undergoes a vulcanization reaction with sulfur, to thereby provide the first polymer composition with vulcanization adhesion to the second layer.
- the rubber component contains at least one selected from the group consisting of a natural rubber, an isoprene rubber, and a butyl rubber.
- the rubber component preferably contains a natural rubber, from the viewpoint of breaking strength and adhesiveness.
- the rubber component content in the polymer component of the polymer composition is preferably not less than 30% by mass and not more than 95% by mass. If the rubber component content is less than 30% by mass, the viscosity of the polymer composition will increase to cause extrusion moldability to deteriorate, and hence, it may be impossible to make the first layer thin. On the other hand, if the rubber component content exceeds 95% by mass, the air permeation resistance of a polymer sheet may deteriorate.
- the rubber component content is preferably not less than 70% by mass and not more than 90% by mass, from the viewpoint of tackiness before vulcanization and vulcanization adhesion.
- the first polymer composition preferably contains sulfur.
- sulfur sulfur generally used in the rubber industry for vulcanization can be used, and insoluble sulfur is particularly preferably used.
- the sulfur content is preferably not less than 0.1 parts by mass and not more than 5 parts by mass, based on 100 parts by mass of the polymer component. If the sulfur content is less than 0.1 parts by mass, a vulcanization effect of the rubber component cannot be attained. On the other hand, if the sulfur content exceeds 5 parts by mass, the hardness of the polymer composition will increase, so that when it is used for the inner liner, the durability of the pneumatic tire may deteriorate.
- the sulfur content is more preferably not less than 0.3 parts by mass and not more than 3.0 parts by mass.
- the first polymer composition can contain additives such as stearic acid, zinc oxide, an antioxidant, a vulcanization accelerator, and the like.
- Stearic acid functions as a vulcanization assistant for the rubber component.
- the stearic acid content is preferably not less than 1 part by mass and not more than 5 parts by mass, based on 100 parts by mass of the polymer component. If the stearic acid content is less than 1 part by mass, an effect of stearic acid as the vulcanization assistant cannot be attained. On the other hand, if the stearic acid content exceeds 5 parts by mass, the viscosity of the polymer composition will decrease, which may undesirably cause breaking strength to decrease.
- the stearic acid content is more preferably not less than 1 part by mass and not more than 4 parts by mass.
- Zinc oxide functions as a vulcanization assistant for the rubber component.
- the zinc oxide content is preferably not less than 0.1 parts by mass and not more than 8 parts by mass, based on 100 parts by mass of the polymer component. If the zinc oxide content is less than 0.1 parts by mass, an effect of zinc oxide as the vulcanization assistant cannot be attained. On the other hand, if the zinc oxide content exceeds 8 parts by mass, the hardness of the polymer composition will increase, and the durability of the pneumatic tire may deteriorate.
- the zinc oxide content is more preferably not less than 0.5 parts by mass and not more than 6 parts by mass.
- An antioxidant functions to prevent a series of degradation phenomena such as oxidation degradation, thermal degradation, ozone degradation, and fatigue degradation.
- Antioxidants are classified into primary antioxidants including amines and phenols, and secondary antioxidants including sulfur compounds and phosphites.
- a primary antioxidant functions to donate hydrogen to various polymer radicals to stop a chain reaction of autooxidation, and a secondary antioxidant exhibits a stabilizing effect by turning hydroxyperoxide into a stable alcohol.
- antioxidants examples include amines, phenols, imidazoles, phosphors, thioureas, and the like. One of the antioxidants mentioned above may be used solely, or two or more of them may be used in combination. N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine is particularly preferably used.
- the antioxidant content is preferably not less than 0.1 parts by mass and not more than 5 parts by mass, based on 100 parts by mass of the polymer component. If the antioxidant content is less than 0.1 parts by mass, an antioxidant effect cannot be attained. On the other hand, if the antioxidant content exceeds 5 parts by mass, the polymer composition will undergo the blooming phenomenon.
- the antioxidant content is more preferably not less than 0.3 parts by mass and not more than 4 parts by mass.
- vulcanization accelerators examples include thiurams, thiazoles, thioureas, dithiocarbamates, guanidines, sulfenamides, and the like. One of these vulcanization accelerators may be used solely, or two or more of them may be combined. Dibenzothiazyl disulfide is particularly preferably used.
- the vulcanization accelerator content is preferably not less than 0.1 parts by mass and not more than 5 parts by mass, based on 100 parts by mass of the polymer component. If the vulcanization accelerator content is less than 0.1 parts by mass, a vulcanization acceleration effect cannot be attained.
- the vulcanization accelerator content is more preferably not less than 0.3 parts by mass and not more than 4 parts by mass.
- the first polymer composition can contain other additives such as a reinforcing agent, a vulcanization agent, various oils, a softener, a plasticizer, a coupling agent, and the like.
- the average thickness of the first layer is preferably not less than 0.05 mm and not more than 0.6 mm. If the thickness of the first layer is less than 0.05 mm, the first layer may be broken by a pressing pressure during the vulcanization of a green tire in which the inner liner is used, and thus, an air leak phenomenon may occur in the resulting tire. On the other hand, if the thickness of the first layer exceeds 0.6 mm, the weight of the tire will increase, and the fuel efficiency performance will deteriorate.
- the thickness of the first layer is preferably not less than 0.05 mm and not more than 0.4 mm.
- the first layer can be obtained by forming the polymer composition into a film by using a general method of forming a thermoplastic resin or a thermoplastic elastomer into a film, such as extrusion molding or calender molding.
- the SIBS which is a thermoplastic elastomer
- the rubber component is dispersed as an island phase.
- Additive components such as sulfur react with this state to cause the rubber component in the island phase to undergo a crosslinking reaction.
- the rubber component is dynamically crosslinked in an extruder, resulting in so-called dynamic crosslinking. Even though the rubber component is crosslinked in the extruder, since the matrix phase of the system is made of a thermoplastic elastomer component, the shear viscosity of the entire system is maintained low, so that extrusion molding is possible.
- the second layer includes a second polymer composition having a polymer component containing not less than 10% by mass and not more than 85% by mass of at least any of a styrene-isoprene-styrene triblock copolymer (hereinafter also referred to as the SIS) and a styrene-isobutylene diblock copolymer (hereinafter also referred to as the SIB), and not less than 10% by mass and not more than 90% by mass of at least one rubber component selected from the group consisting of a natural rubber, an isoprene rubber, and a butyl rubber.
- SIS styrene-isoprene-styrene triblock copolymer
- SIB styrene-isobutylene diblock copolymer
- the isoprene block of the SIS and the isobutylene block of the SIB are soft segments, a polymer film containing the SIS or SIB can easily be vulcanized and adhered to the rubber component.
- an inner liner including the second layer containing the SIS or SIB is used, therefore, a pneumatic tire having excellent adhesive strength between the inner liner and the rubber layer of the carcass ply can be obtained. The durability and the riding comfort of the pneumatic tire can thus be improved.
- a weight-average molecular weight measured by GPC is preferably 100,000 to 290,000, from the viewpoint of the rubber elasticity of the SIS, as well as moldability to the inner liner. If the weight-average molecular weight is less than 100,000, the rubber elasticity and tensile strength of the SIS may deteriorate. On the other hand, if the weight-average molecular weight exceeds 290,000, deterioration of the fluidity of the SIS may cause moldability (extrusion moldability, for example) to the inner liner to deteriorate.
- the styrene component content in the SIS is preferably 10 to 30% by mass, from the viewpoint of the tackiness and rubber elasticity of the SIS, as well as the adhesive strength of the second layer to the first layer and the carcass ply.
- the degree of polymerization of the isoprene block is preferably about 500 to 5,000, and the degree of polymerization of the styrene block is about 50 to 1,500, from the viewpoint of the rubber elasticity and handleability of the SIS.
- the SIS can be obtained using a general polymerization method for a vinyl-based compound, such as a living cationic polymerization method.
- a straight-chain SIB is preferably used from the viewpoint of rubber elasticity, as well as the adhesive strength of the second layer to the first layer and the carcass ply.
- the molecular weight of the SIB is not particularly limited, a weight-average molecular weight measured by GPC is preferably 40,000 to 120,000, from the viewpoint of the rubber elasticity of the SIB, as well as moldability to the inner liner. If the weight-average molecular weight is less than 40,000, the rubber elasticity and tensile strength of the SIB may deteriorate.
- the styrene component content in the SIB is preferably 10 to 35% by mass, from the viewpoint of the tackiness and rubber elasticity of the SIB, as well as the adhesive strength of the second layer to the first layer and the carcass ply.
- the SIB can be obtained using a general polymerization method for a vinyl-based compound, such as a living cationic polymerization method.
- the second polymer composition may contain the SIS and SIB, or may have a multilayer structure of a layer containing the SIS and a layer containing an SIB.
- the second polymer composition contains a rubber component.
- the rubber component is capable of providing the second polymer composition with tackiness before vulcanization to adjacent members such as the first layer and the carcass ply. Moreover, the rubber component undergoes a vulcanization reaction with sulfur, to thereby provide the polymer composition with vulcanization adhesion to the adjacent members such as the first layer and the carcass ply.
- the rubber component contains at least one selected from the group consisting of a natural rubber, an isoprene rubber, and a butyl rubber, and, among the above, the rubber component preferably contains a natural rubber, from the viewpoint of breaking strength and adhesiveness.
- the rubber component content in the polymer component of the polymer composition is preferably not less than 10% by mass and not more than 90% by mass. If the rubber component content is less than 10% by mass, the viscosity of the polymer composition will increase to cause extrusion moldability to deteriorate, and hence, it may be impossible to make the second layer thin. On the other hand, if the rubber component content exceeds 90% by mass, the air permeation resistance of the second layer may deteriorate. When the amount of the rubber component is within the above-mentioned range, the tackiness before vulcanization and the adhesiveness after vulcanization are improved.
- the second polymer composition can contain additives such as sulfur, stearic acid, zinc oxide, an antioxidant, a vulcanization accelerator, and the like.
- additives such as sulfur, stearic acid, zinc oxide, an antioxidant, a vulcanization accelerator, and the like.
- the types and the amounts thereof can be adjusted as appropriate, depending on the required properties.
- the average thickness of the second layer is preferably not less than 0.01 mm and not more than 0.3 mm.
- the thickness of the second layer when the second layer is constituted of a single layer refers to the thickness thereof, and the thickness of the second layer when the second layer has a multilayer structure such as a two-layer structure refers to a total thickness of the multilayer structure. If the thickness of the second layer is less than 0.01 mm, the second layer may be broken by a pressing pressure during the vulcanization of a green tire in which the inner liner is used, which may cause vulcanization adhesive strength to deteriorate. On the other hand, if the thickness of the second layer exceeds 0.3 mm, the weight of the tire will increase, and the fuel efficiency performance will deteriorate.
- the thickness of the second layer is preferably not less than 0.05 mm and not more than 0.2 mm.
- the second layer can be obtained by forming a polymer composition containing at least any of the SIS and SIB and optionally added additive(s) into a film by using a general method of forming a thermoplastic resin or a thermoplastic elastomer into a film, such as extrusion molding or calender molding.
- the SIB or SIS which is a thermoplastic elastomer
- the rubber component is dispersed as an island phase.
- Additive components such as sulfur react with this state to cause the rubber component in the island phase to undergo a crosslinking reaction.
- the rubber component is dynamically crosslinked in an extruder. Since the matrix phase is made of a thermoplastic elastomer component, the shear viscosity of the entire system is maintained low, and hence, extrusion molding is possible.
- first polymer composition and the second polymer composition may be mixed with one or more thermoplastic elastomers, as other polymer components, selected from the group consisting of a styrene-isoprene butadiene-styrene copolymer, a styrene-ethylene butene-styrene copolymer, a styrene-ethylene propylene-styrene copolymer, a styrene-ethylene-ethylene-propylene-styrene copolymer, a styrene-butadiene - butylene-styrene copolymer), and a thermoplastic elastomer obtained by introducing an epoxy group into any of the above.
- thermoplastic elastomer having an epoxy group may be an epoxy-modified styrene-butadiene-styrene copolymer (a specific example is an epoxized SBS, "Epofriend A1020", manufactured by Daicel Chemical Industries, Ltd., weight-average molecular weight: 100,000, epoxy equivalent: 500).
- an inner liner 10 is constituted of a first layer 11 and a second layer 12. Inner liner 10 is disposed outwardly in the tire radius direction such that second layer 12 comes into contact with carcass ply 61. This can improve adhesive strength between second layer 12 and carcass ply 61 in the vulcanization step of a tire.
- a polymer laminate can be obtained using the polymer composition of the first layer and the polymer composition of the second layer, by performing lamination extrusion such as laminate extrusion or co-extrusion in the order illustrated in Fig. 2 .
- inner liner 10 is constituted of first layer 11, second layer 12, and a rubber sheet layer 13. Inner liner 10 is disposed outwardly in the tire radius direction such that rubber sheet layer 13 comes into contact with carcass ply 61. This can improve adhesive strength between rubber sheet layer 13 and carcass ply 61 in the vulcanization step of the tire.
- a pneumatic tire can be produced using a general manufacturing method. Specifically, a pneumatic tire can be manufactured by using inner liner 10 as the inner liner of a green tire for pneumatic tire 1, and vulcanization-molding it together with other members.
- inner liner 10 When inner liner 10 is placed on the green tire, it is placed outwardly in the tire radius direction such that second layer 12 or rubber sheet layer 13 of polymer laminate 10 comes into contact with carcass ply 6. That is, first layer 11 is placed inwardly in the tire radius direction. This placement can improve adhesive strength between the second layer or rubber sheet layer 13, and carcass ply 6 in the tire vulcanization step.
- thermoplastic elastomer and the rubber component constituting each of the first layer and the second layer of the inner liner are in a softened state (an intermediate state between a solid and a liquid) within a mold at a temperature during vulcanization, from 150 to 180°C, for example. Therefore, when the mold is opened after the vulcanization, the inner liner will become deformed if the thermoplastic elastomer and the rubber component are in the softened state. Furthermore, since the thermoplastic elastomer and the rubber component are more reactive when in the softened state than in the solid state, they may stick or adhere to the adjacent members.
- a cooling step is thus preferably provided after vulcanization.
- the thermoplastic elastomer and the rubber component directly after the vulcanization can be quenched for 10 seconds or longer at 120°C or below to be solidified.
- the cooling may be performed by quenching the inside of the bladder at a temperature in the range of 50 to 120°C.
- a coolant one or more of coolants selected from air, water vapor, water, and oil can be used.
- the cooling time is preferably 10 to 300 seconds. If the cooling time is shorter than 10 seconds, the thermoplastic elastomer and the rubber component are not sufficiently cooled, and the inner liner may still be fused to the bladder when the mold is opened, which may cause an air-in phenomenon. If the cooling time exceeds 300 seconds, the productivity will become lower.
- the cooling time is preferably 30 to 180 seconds.
- the SIB, SIBS, and SIS to be used for the first layer and the second layer were prepared as follows.
- SIBSTAR 102T (Shore A hardness: 25, styrene component content: 25% by mass, and weight-average molecular weight: 100,000), manufactured by Kaneka Corporation, was used.
- D1161JP (styrene component content: 15% by mass, weight-average molecular weight: 150,000), manufactured by Kraton Polymers, was used.
- the compounding ingredients were introduced into a twin-screw extruder (screw diameter: ⁇ 50 mm, L/D: 30, cylinder temperature: 200°C), and kneaded at 200 rpm to form pellets.
- the resulting pellets were introduced into a T-die extruder (screw diameter: ⁇ 80 mm, L/D: 50, die gap width: 500 mm, cylinder temperature: 220°C, film gauge: 0.3 mm) in accordance with the specifications shown in Table 3, and polymer sheets for inner liners were produced.
- an extrusion port of the polymer sheet was provided with a profile, and an integrated sheet having a smaller thickness Gs in the buttress region was produced.
- the resulting polymer sheets for inner liners were used for 195/65R15-size pneumatic tires having the basic structure illustrated in Fig. 1 to produce green tires, which were press-molded for 20 minutes at 170°C in the subsequent vulcanization step.
- vulcanization adhesive strength vulcanization adhesive strength of each formulation / vulcanization adhesive strength of Comparative Example 1 ⁇ 100
- Each of the pneumatic tires was mounted on a JIS standard rim 15 x 6JJ, and an initial air pressure of 300 Kpa was applied. The tire was left at room temperature for 90 days, and an air pressure drop rate (%/month) was calculated. (Rolling Resistance)
- each pneumatic tire was mounted on a JIS standard rim 15 x 6JJ, and rolling resistance was measured while driving the tire at room temperature (38°C) under the conditions of a load of 3.4 kN, an air pressure of 230 kPa, and a speed of 80 km/hour.
- the rolling resistance of the pneumatic tire was expressed as an index, using Comparative Example 1 as the reference value (100). The greater the rolling resistance index, the smaller the rolling resistance, which is preferable.
- rolling resistance index rolling resistance of Comparative Example 1 / rolling resistance of each pneumatic tire ⁇ 100
- a running endurance test was conducted to evaluate whether the inner liner was cracked or peeled off.
- Each pneumatic tire was mounted on a JIS standard rim 15 x 6JJ, and the tire internal pressure was set to 150 KPa, which was lower than normal. With the load being set to 600 kg, the speed 100 km/h, and the mileage 20,000 km, the inside of the tire was observed, and the number of cracks and peeled portions was measured.
- the crack growth resistance of each pneumatic tire was expressed as an index, using Comparative Example 1 as a reference. The greater the value of the index, the smaller the flex crack growth.
- index of flex crack growth number of cracks in Comparative Example 1 / number of cracks in each Example ⁇ 100
- Each tire was mounted on a front-engine, rear-wheel-drive passenger car having a displacement of 2000 cm 3 .
- the internal pressure of the tire was set to 230 kPa.
- This passenger car was subjected to a running test on an asphalt road, and a sensory evaluation by the driver was made on riding comfort.
- the shock absorbing property was evaluated as the riding comfort.
- the riding comfort was expressed as an index, using Comparative Example 1 as the reference (100). The higher the score, the better the riding comfort.
- Each of Examples 1 to 4 corresponds to a pneumatic tire including an inner liner that uses Example Formulation A1 or A2 for the first layer, and uses any of Example Formulations B 1 to B6 for the second layer.
- the vulcanization adhesive strength between the first layer and the second layer, the crack resistance performance, and the riding comfort were improved, and the static air pressure drop rate and the rolling resistance were nearly equal to those in Comparative Example 1.
- Comparative Example 2 corresponds to a pneumatic tire including an inner liner that uses Comparative Formulation A5 for the first layer and Comparative Formulation B8 for the second layer.
- the vulcanization adhesive strength between the first layer and the second layer, the static air pressure drop rate, the riding comfort, and the crack resistance performance were equal to those in Comparative Example 1.
- Each of Comparative Examples 3 to 5 corresponds to a pneumatic tire including an inner liner that uses Comparative Formulation A6 or A7 for the first layer and Comparative Formulation B7 or B8 for the second layer.
- Comparative Example 1 the vulcanization adhesive strength between the first layer and the second layer was satisfactory, but the static air pressure drop rate was insufficient.
- Each of Examples 1 and 5 and Comparative Examples 6 and 7 corresponds to a pneumatic tire including an inner liner that uses Example Formulation A1 for the first layer and Example Formulation B1 for the second layer.
- Gs/Gb was 0.5 in Example 1, 0.7 in Example 5, 0.3 in Comparative Example 6, and 1.0 in Comparative Example 7.
- the vulcanization adhesive strength between the first layer and the second layer, the crack resistance performance, and the riding comfort were improved, and the static air pressure drop rate and the rolling resistance decreased, as compared with Comparative Example 1.
- Comparative Example 6 the static air pressure drop rate increased, and the crack resistance performance was poor, as compared with Comparative Example 1.
- Comparative Example 7 the rolling resistance and the static air pressure drop rate increased, and the crack resistance performance was poor, as compared with Comparative Example 1.
- the pneumatic tire according to the present invention can be used not only as a pneumatic tire for a passenger car, but also as a pneumatic tire for a truck or a bus, a pneumatic tire for a heavy industrial machine, or the like.
- 1 pneumatic tire
- 2 tread portion
- 3 side-wall portion
- 4 bead portion
- 5 bead core
- 6, 61 carcass ply
- 7 belt ply
- 8 bead apex
- 9,10 inner liner
- 11 first layer
- 12 second layer
- 13 rubber sheet layer
- Rb bead region
- Rs buttress region
- Le tire maximum width position
- Lt bead toe
- Lu position corresponding to belt layer end.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Claims (3)
- Luftreifen (1), der einen Innerliner (10) auf eine Innenseite des Reifens (1) umfasst,
wobei der Innerliner (10) umfasst:eine erste Schicht, die eine erste Polymerzusammensetzung mit einer Polymerkomponente umfasst, die nicht weniger als 5 Masse-% und nicht mehr als 70 Masse-% eines Styrol-Isobutylen-Styrol-Triblockcopolymers und nicht weniger als 30 Masse-% und nicht mehr als 95 Masse-% von zumindest einer Kautschukkomponente enthält, die aus der Gruppe ausgewählt ist, die aus einem Naturkautschuk, einem Isoprenkautschuk und einem Butylkautschuk besteht; undeine zweite Schicht, die eine zweite Polymerzusammensetzung mit einer Polymerkomponente umfasst, die nicht weniger als 10 Masse-% und nicht mehr als 85 Masse-% von zumindest irgendeinem Styrol-Isopren-Styrol-Triblockcopolymer und einem Styrol-Isobutylen-Diblockcopolymer und nicht weniger als 10 Masse-% und nicht mehr als 90 Masse-% von zumindest einer Kautschuckkomponente enthält, die aus der Gruppe ausgewählt ist, die aus einem Naturkautschuk, einem Isoprenkautschuk und einem Butylkautschuk besteht,wobei die erste Schicht in einer Radiusrichtung des Reifens nach innen hin platziert ist,dadurch gekennzeichnet, dass der Innerliner (10) eine mittlere Dicke Gs in einem Endbereich Rs von einer Position maximaler Breite des Reifens zu einer Position, die einem Gürtelschichtende Lu entspricht, und eine mittlere Dicke Gb in einem Wulstbereich Rb von der Position maximaler Breite des Reifens zu einer Wulstzehe aufweist, wobei ein Verhältnis der mittleren Dicke Gs zu der mittleren Dicke Gb (Gs/Gb) nicht kleiner als 0,5 und nicht größer als 0,7 ist. - Luftreifen (1) nach Anspruch 1, wobei die mittlere Dicke Gs des Endbereichs in dem Innerliner nicht kleiner als 0,06 mm und nicht größer als 0,30 mm ist.
- Luftreifen-(1) nach Anspruch 1 oder 2, wobei zumindest eine von der ernsten Polymerzusammensetzung und der zweiten Polymerzusammensetzung bezogen auf 100 Masseteile der Polymerkomponente nicht weniger als 0,1 Masseteile und nicht mehr als 5 Masseteile Schwefel, nicht weniger als 1 Masseteil und nicht mehr als 5 Masseteile Stearinsäure, nicht weniger als 0,1 Masseteile und nicht mehr als 8 Masseteile Zinkoxid, nicht weniger als 0,1 Masseteile und nicht mehr als 5 Masseteile eines Antioxidationsmittels und nicht weniger als 0,1 Masseteile und nicht mehr als 5 Masseteile eines Vulkanisationsbeschleunigers enthält.
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JP2012265358 | 2012-12-04 | ||
PCT/JP2013/070467 WO2014087697A1 (ja) | 2012-12-04 | 2013-07-29 | 空気入りタイヤ |
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EP2921321A1 EP2921321A1 (de) | 2015-09-23 |
EP2921321A4 EP2921321A4 (de) | 2016-08-03 |
EP2921321B1 true EP2921321B1 (de) | 2017-09-20 |
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EP (1) | EP2921321B1 (de) |
JP (1) | JP6262646B2 (de) |
CN (1) | CN104797434B (de) |
WO (1) | WO2014087697A1 (de) |
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JP5066921B2 (ja) | 2007-01-17 | 2012-11-07 | 横浜ゴム株式会社 | 空気入りタイヤ |
JP4435253B2 (ja) * | 2008-03-26 | 2010-03-17 | 住友ゴム工業株式会社 | インナーライナーおよび空気入りタイヤ |
KR101767452B1 (ko) * | 2010-07-05 | 2017-08-14 | 삼성디스플레이 주식회사 | 액정 표시 장치의 백라이트 유닛 |
EP2415617B1 (de) * | 2010-07-30 | 2014-05-14 | Sumitomo Rubber Industries, Ltd. | Polymerfolie für einen Innenmantel, Polymerlaminat für einen Innenmantel und Luftreifen damit |
JP5632684B2 (ja) * | 2010-09-03 | 2014-11-26 | 住友ゴム工業株式会社 | 空気入りタイヤおよびその製造方法 |
KR20140032423A (ko) * | 2011-05-13 | 2014-03-14 | 스미토모 고무 고교 가부시키가이샤 | 공기 타이어 |
KR20140044902A (ko) * | 2011-07-28 | 2014-04-15 | 스미토모 고무 고교 가부시키가이샤 | 공기 타이어 |
CN103917380A (zh) * | 2011-11-09 | 2014-07-09 | 住友橡胶工业株式会社 | 充气轮胎 |
JP5349630B2 (ja) * | 2012-02-06 | 2013-11-20 | 住友ゴム工業株式会社 | 空気入りタイヤ |
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- 2013-07-29 US US14/440,527 patent/US20150290974A1/en not_active Abandoned
- 2013-07-29 CN CN201380060696.0A patent/CN104797434B/zh active Active
- 2013-07-29 EP EP13859829.7A patent/EP2921321B1/de active Active
- 2013-07-29 WO PCT/JP2013/070467 patent/WO2014087697A1/ja active Application Filing
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CN104797434B (zh) | 2017-07-04 |
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JP6262646B2 (ja) | 2018-01-17 |
EP2921321A1 (de) | 2015-09-23 |
WO2014087697A1 (ja) | 2014-06-12 |
CN104797434A (zh) | 2015-07-22 |
US20150290974A1 (en) | 2015-10-15 |
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